diff --git a/tools/src/main/java/cz/o2/proxima/tools/groovy/Console.java b/tools/src/main/java/cz/o2/proxima/tools/groovy/Console.java
index 3169a955d..ff1fca3e4 100644
--- a/tools/src/main/java/cz/o2/proxima/tools/groovy/Console.java
+++ b/tools/src/main/java/cz/o2/proxima/tools/groovy/Console.java
@@ -307,7 +307,7 @@ public void put(
       AttributeDescriptor<?> attrDesc,
       String key,
       String attribute,
-      Object value)
+      String value)
       throws InterruptedException {
 
     put(entityDesc, attrDesc, key, attribute, System.currentTimeMillis(), value);
@@ -319,7 +319,7 @@ public void put(
       String key,
       String attribute,
       long stamp,
-      Object value)
+      String value)
       throws InterruptedException {
 
     Preconditions.checkState(
@@ -328,7 +328,7 @@ public void put(
     @SuppressWarnings("unchecked")
     ValueSerializer<Object> valueSerializer =
         (ValueSerializer<Object>) attrDesc.getValueSerializer();
-    byte[] payload = valueSerializer.serialize(valueSerializer.fromJsonValue(value.toString()));
+    byte[] payload = valueSerializer.serialize(valueSerializer.fromJsonValue(value));
     OnlineAttributeWriter writer = Optionals.get(direct.getWriter(attrDesc));
     CountDownLatch latch = new CountDownLatch(1);
     AtomicReference<Throwable> exc = new AtomicReference<>();
diff --git a/tools/src/main/resources/class-entitydesc.ftlh b/tools/src/main/resources/class-entitydesc.ftlh
index 91571b660..2523c2d2e 100644
--- a/tools/src/main/resources/class-entitydesc.ftlh
+++ b/tools/src/main/resources/class-entitydesc.ftlh
@@ -135,11 +135,11 @@ class Environment implements RepositoryProvider {
             def List<KeyValue<${attribute.type}>> listPrefix(String key, String prefix) {
               return ${entity.classname}Descriptor.this.reader.list(key, desc.toAttributePrefix() + prefix)
             }
-            def void put(String key, String attribute, ${attribute.type} value) {
-              console.put(${entity.classname}Descriptor.this.desc, desc, key, desc.toAttributePrefix() + attribute, value)
+            def void put(String key, String attribute, String jsonValue) {
+              console.put(${entity.classname}Descriptor.this.desc, desc, key, desc.toAttributePrefix() + attribute, jsonValue)
             }
-            def void put(String key, String attribute, long stamp, ${attribute.type} value) {
-              console.put(${entity.classname}Descriptor.this.desc, desc, key, desc.toAttributePrefix() + attribute, stamp, value)
+            def void put(String key, String attribute, long stamp, String jsonValue) {
+              console.put(${entity.classname}Descriptor.this.desc, desc, key, desc.toAttributePrefix() + attribute, stamp, jsonValue)
             }
             def void delete(String key, String attribute) {
               console.delete(${entity.classname}Descriptor.this.desc, desc, key, desc.toAttributePrefix() + attribute)
@@ -157,11 +157,11 @@ class Environment implements RepositoryProvider {
             def KeyValue<${attribute.type}> get(String key) {
               return ${entity.classname}Descriptor.this.reader.get(key, name)
             }
-            def void put(String key, ${attribute.type} value) {
-              console.put(${entity.classname}Descriptor.this.desc, desc, key, desc.getName(), value)
+            def void put(String key, String jsonValue) {
+              console.put(${entity.classname}Descriptor.this.desc, desc, key, desc.getName(), jsonValue)
             }
-            def void put(String key, long stamp, ${attribute.type} value) {
-              console.put(${entity.classname}Descriptor.this.desc, desc, key, desc.getName(), stamp, value)
+            def void put(String key, long stamp, String jsonValue) {
+              console.put(${entity.classname}Descriptor.this.desc, desc, key, desc.getName(), stamp, jsonValue)
             }
             def void delete(String key) {
               console.delete(${entity.classname}Descriptor.this.desc, desc, key, desc.getName())
diff --git a/tools/src/test/java/cz/o2/proxima/tools/groovy/util/ConsoleRandomReaderTest.java b/tools/src/test/java/cz/o2/proxima/tools/groovy/util/ConsoleRandomReaderTest.java
index 8ca882cf5..47d0cc1e7 100644
--- a/tools/src/test/java/cz/o2/proxima/tools/groovy/util/ConsoleRandomReaderTest.java
+++ b/tools/src/test/java/cz/o2/proxima/tools/groovy/util/ConsoleRandomReaderTest.java
@@ -15,8 +15,7 @@
  */
 package cz.o2.proxima.tools.groovy.util;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.*;
 
 import cz.o2.proxima.core.repository.AttributeDescriptor;
 import cz.o2.proxima.core.repository.EntityDescriptor;
@@ -43,7 +42,7 @@ public class ConsoleRandomReaderTest {
 
   @Test(timeout = 10000)
   public void testConsoleRandomReaderRead() throws InterruptedException {
-    console.put(proxied, ints, "key", "ints.1", 1);
+    console.put(proxied, ints, "key", "ints.1", "1");
     KeyValue<Integer> result =
         console.getRandomAccessReader(proxied.getName()).get("key", "ints.1");
     assertNotNull(result.getValue());
@@ -60,4 +59,11 @@ public void testConsoleRandomReaderRead() throws InterruptedException {
         Collections.singletonList("key"),
         keys.stream().map(Pair::getSecond).collect(Collectors.toList()));
   }
+
+  @Test
+  public void testConsolePut() throws InterruptedException {
+    console.put(proxied, ints, "key", "ints.1", "1");
+    assertThrows(
+        NumberFormatException.class, () -> console.put(proxied, ints, "key", "ints.2", "\"2\""));
+  }
 }